[NaCl SDK] A bunch of spelling fixes.

native_client_sdk/src/examples/file_histogram/file_histogram.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /// @file file_histogram.cc
 /// This example demonstrates loading, running and scripting a very simple NaCl
 /// module.  To load the NaCl module, the browser first looks for the
 /// CreateModule() factory method (at the end of this file).  It calls
 /// CreateModule() once to load the module code from your .nexe.  After the
 /// .nexe code is loaded, CreateModule() is not called again.
@@ skipping 39 matching lines @@
 namespace {
 
 const uint32_t kBlue = 0xff4040ffu;
 const uint32_t kBlack = 0xff000000u;
 const size_t kHistogramSize = 256u;
 
 }  // namespace
 
 /// The Instance class.  One of these exists for each instance of your NaCl
 /// module on the web page.  The browser will ask the Module object to create
-/// a new Instance for each occurence of the <embed> tag that has these
+/// a new Instance for each occurrence of the <embed> tag that has these
 /// attributes:
 ///     type="application/x-nacl"
 ///     src="file_histogram.nmf"
 class FileHistogramInstance : public pp::Instance {
  public:
   /// The constructor creates the plugin-side instance.
   /// @param[in] instance the handle to the browser-side plugin instance.
   explicit FileHistogramInstance(PP_Instance instance)
       : pp::Instance(instance),
         callback_factory_(this),
@@ skipping 157 matching lines @@
 namespace pp {
 /// Factory function called by the browser when the module is first loaded.
 /// The browser keeps a singleton of this module.  It calls the
 /// CreateInstance() method on the object you return to make instances.  There
 /// is one instance per <embed> tag on the page.  This is the main binding
 /// point for your NaCl module with the browser.
 Module* CreateModule() {
   return new FileHistogramModule();
 }
 }  // namespace pp